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state Rea. <br />• ponds are designed for controlling runoff from disturbed <br />areas. All diversions and carrimant control structures are <br />designed in aocoxs3ance with the applicable regulations <br />and conform to cunrently accepted engineering Practice. <br />Power distribution system at Seneca which services high <br />voltage electrical stripping equiptrent and ,m,cr be well <br />planned for optimmi accessibility. Power for stripping <br />equipnent is normally routed fx+an the highwall or tudistisbed <br />side of the active pit because of its ease of access aryl to <br />alleviate mining and reclamation h;nfi-anroa, <br />A very lI[QJOrtarlt task rerniirirg utilization of the best <br />available engineering techniques is the design of the most <br />stable postrnine laid surface. Determination of such factors <br />as spoil swell, stream gradients, posttnine lard use, spoil <br />character, and foundation materials will affect the design of <br />• a surface of approximate original contour. ZSte currently <br />accepted technique is to design a surface whose slopes do not <br />exceed the nr~iin;m slope arnd whose general configuration <br />approximates the preminirg surface. <br />2.05.2(1) Area surface mining is the most efficient method of recovery <br />4.01.1 of coal resource, especially in areas such as Seneca where the <br />coal is of such a quality that it can be shipped to the power <br />plant without processing. At Seneca II, the Wolf GYeek and <br />Wadge seams are being mined to depths of approximately 140 and <br />100 feet, respectively, (limitation of the stripping <br />equipment) with a resotnroe recovery rate approaching 95 <br />percent. Table 12-2 illustrates the anticipated annual and <br />total production of coal fz'aa Seneca II remaining fx~n 1-1-92 <br />2.05.2(1) thrar~n the life~f-mine. Table 12-2A lists the actual annual <br />2.05.3(1) and total production of coal fnxn Seneca II for the 1987 to <br />• <br />12-7 Revised 08/20/93 <br />